looks like the sdcard I left in the slot no longer wants to boot ,
trying again KOPRajs thanks
verified working so far , just downloaded your firmware and tossed it onto rockpro64 image and it worked
PINE64 RockPro64 LibreELEC-RK3399.arm-9.1.001-rockpro64.img.gz
sadly same issue black screen with 10 bit stuff etc but i guess that is to be expected if were still trying to use the original firmware ...
and SPDIF just drops in and out